Diamond-polishing machine.



B. & G. A. DE GRAAP.

DIAMOND POLISHING MACHINE.

APPLICATION FILED mum, 1911.

1,077,396, Patented N0v.4, 1913.

46 If L I 5 WITNESSES: INVENTORS/ fi-m 97 wwmjf .cLunmlA PLA'NOGRAPH co., WASHINGTON, D. c.

W By

ATTORNEY B. & G. A. DE GRA AP. DIAMOND POLISHING MACHINE.

APPLICATION FILED FEB; 2, 1911. 1,077,396. I Patented Nov. 4, 1913.

2 SHEETS-SHEET 2' WITNESSES. 73 INVENTORSIg W m 24% @;/@M

COLUMBIA PLANQGRAPH co, WASHINGTON, n. c.

UNITED STAT PATENT @FFEQE.

BENJAMIN DE GRAAF AND GERRIT A. DE GRAAF, OF BLOOMFIELD, NEW JERSEY; SAID BENJAMIN DE GRAAF ASSIGNOR TO SAID GERR-IT A. DE GRAAF.

DIAMOND-POLISHING MACHINE.

Specification of Letters Patent.

Patented Nov. 4, 1913.

To (ZZZ whom it may concern Be it known that we, BENJAMIN DE GRAAF and GERRIT A. on GRAAF, subjects of the Queen of Holland, and residing at Bloomfield, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Diamond-Polishing Machines, of which the following is a specification.

Our invention relates to various improvements in the mechanisms employed in holding, polishing and finishing diamonds, sapphires, rubies, and other precious or semiprecious stones and has for its object to facilitate the handling of the stones while being cut, polished or prepared for use. 7 The devices usually employed for holding diamonds or other stones while being polished are clumsy, crude and unhandy, and they do not admit of accurate and rapid manipulation. Usually it has been necessary to provide a handle or dop as it is technically called, for each diamond and to reset the diamond in a solder of lead and tin in the end of the dop for grinding or polishing each face, thus entailing the loss of much time and requiring a large number of ,dops or handles.

e have, in our invention, simplified this by providing a universal chunk or dop by means of which the diamond may be held in the required posit-ions for either polishing or preparing for use, irrespective of its size, shape or the part of the diamond to be worked on.

e have illustrated our improvement in the accompanying drawings wherein- Figures 1 and 2 show the work table and polishing wheel of a diamond polishing machine together with a bracket support for the chuck; and the chuck in two working positions; Fig. 8 is a top plan view of our improved chuck; Fig. 4 is a side elevation; Fig. 5 is a bottom View and Fig. 6 is a vertical cross-section showing the construction thereof. a

A work table 46 is suitably supported under the lapidary Wheel 11, upon which is mounted an arm bracket 47 as seen in Figs. 1 and 2. The overhanging end of the arm 47 is fitted with a pinching clamp 18 adapted by means of the clamping bolt 49 to hold the diamond chuck 50 in proper position over the lapidary wheel 11 secured to and adapted to rotate with the shaft 13 in any usual or preferred manner. The details of the chuck 50 are best shown in Figs. 3 to 6. The body portion of the chuck is sub,- stantially cylindrical and the chuck end is out off at an angle to the axis to form a face 51 to receive the angularly disposed chuck plate 52 which is shouldered on its back face at '53 to fit into a recess in the face 51, upon which it is adapted to be rotated to bring one or another of a series of circumferentially arranged holes or cups 54 into chucking position parallel to the axis of the chuck. Any convenient number of cups or holes 54: may be made on the plate 52 and the holes may be of the same or different sizes to accommodate diamonds of various sizes. To properly position the cups 54 at the working position, a pin 55 is inserted in the chuck body and projects outward into position to enter one of the holes 56 in the under face of the plate 52, thereby holding the selected cup 5a in the proper position.

For the purpose of clamping the diamond to be worked upon in the cup 54t, an adjustable forked clamp 57 is secured to one end of a bolt 58 which is slidably mounted in a hole through the axis of the chuck body 50. A-key 59 is inserted to prevent turning of the bolt. The opposite end 60 of the bolt is reduced in size and threaded, and is provided with a nut 61 adapted to fit'loosely in acounterbored portion of the hole in which the bolt slides. The nut has a circular flange 62 whereby it is loosely held in the counterbore by the collar orring 63. From this arrangement it will beseen that bolt 58 may be caused to slide up or down the hole by turning the knurled head of the nut 61 thereby moving the clamping fingers 57 into or out of position to clamp the diamond in the hole or cup 54:. The relative distances between the clamping fingers 57 may be adjusted by means of the screw 64:.

At the back of the chuck and in a plane passing through the axis and through the highest point of the, face 51 of the chuck are located handle holes 65 in each of which is inserted a hollow internally threaded nut 66 into which the handle 67 may be screwed, which handle preferably consists of a rod of copper. The handle holes 65 it will be noted are arranged at an angle to each other so that insertion of the handle in one or the other of the holes will position the chuck at a difierent angle when it is secured in the clamp 48 on the arm 47, as shown in Figs. 1 and 2, the object being to bring either the top or the lateral facets of the diamond or other stone into position to be cut or polished by the lapidary wheel 11.

The handle being of soft copper or other suitable material may readily be slightly bent so as to adjust the chuck and bring the diamond into the desired position to overcome any irregularities in the shape of the stone being worked upon.

We claim 1. A machine for the purpose described comprising a revoluble wheel, a diamond holding chuck cooperating therewith, a rotatable adjustable plate on said chuck, a pin coacting with holes to hold the plate when adjusted, a plurality of cups on the outer face of said plate, an adjustable clamp cooperating with said cups to hold a diamond in working position, a plurality of handle socket nuts in the body of said chuck, and clamping means for holding the chuck in one or another position according to the handle socket in which the handle is inserted, and means for revolving said Wheel across the face of said chuck.

2. A machine for the purpose described, comprising a revoluble wheel, and a cooperating chuck provided with a body portion, a clamping bolt passing through the axis thereof, means to prevent turning of the bolt, clamping fork arms secured to the end of said bolt, means for adjusting the dis tance between the fork arms, a rotatably adjustable plate on said body portion at an angle to the axis thereof and through which said bolt is adapted to pass, means for holding the plate in adjusted position, a plurality of circumferentially arranged cups on said plate and means for clamping a diamond between the fork arm and one of said cups.

3; A machine for the purpose described comprising a revoluble wheel, and a cooperating chuck provided with a body portion, an angularly disposed rotatable plate having means which when rotated into position for use is adapted to hold a diamond with its axial line parallel to the axis of said body portion, and means cooperating with said diamond holding means for clamping a diamond in said position.

i. A machine for the purpose described comprising a revoluble wheel, and a cooperating chuck provided with a body portion,

-a rotatably adjustable plate atan angle to the axis of the body portion, a plurality of diamond holding receptacles on said plate, any one of which when rotated into position for use is adapted to hold a diamond with its axial line parallel to the axis of said body portion, a clamping bolt carrying 'clainping fingers, and means for clamping a diamond between said fingers and the receptacle on said plate which isin position for use.

5. In a machine for the purpose described,

a diamond holding chuck comprising a body portion, a revolubly adjustable plate at an angle to the axis of the body portion, diamond holding cups on said plate each adapt= ed, by adjusting the plate, to be brought into a position with its axis parallel to the axis of said body portion and coacting means between the plate and said body portion for positioning and holding said plate with one of the cups in said position.

6. In a machine for the purpose described, a diamond holding chuck comprising a body portion, a revolubly adjustable plate at an angle to the axis of the body portion, diamond holding cups on said plate each adapted, by adjusting the plate, to be brought into a position with its axis parallel to the axis of said body portion, coacting means between the plate and said body portion for positioning and holding said plate with one of the cups in said position, and means for clamping a diamond in the positioned cup.

7 In a machine for the purpose described, a lapidary wheel, a diamond holding chuck comprising a body portion, a revolubly adjustable plate at an angle to the axis of the body portion provided with a plurality of diamond holding cups each adapted to be brought into a position with its axis parallel to the axis of said body portion, means for holding the plate with one of the cups in said position and handle sockets in said body portion, one adapted to hold the chuck with its axis perpendicular to said lapidary wheel and the other to hold it at an angle to the wheel.

8. In a machine for thepurpose described,

a lapid'ary wheel, a diamond holding chuck.

comprising a body portion, a re'volubly ad justable plate at an angle to the axis of the body portion provided with a plurality of diamond holding cups each adapted to be brought into a position with its axis parallel to the axis of said body portion, means for p holding theplate with one of the cups in said position, handle sockets in said body' In testimony whereof, We have hereunto portion, one adapted to hold the chuck with set our hands in the presence of two sub- 10 its axis perpendicular to said lap-idary Wheel scribing Witnesses.

and the other to hold it at an angle to the BENJAMIN on GRAAF.

= wheel, and means operable through the axis GERRIT A. on GRAAF.

of said body portion and through said plate Witnesses: for clamping a diamond in the positioned FRANCESIBLSTEWART, cup. JOANNA S. PAoH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G." 

